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/* Memory attributes support, for GDB.

   Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010

   Free Software Foundation, Inc.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify

   it under the terms of the GNU General Public License as published by

   the Free Software Foundation; either version 3 of the License, or

   (at your option) any later version.

   This program is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License

   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#include "defs.h"

#include "command.h"

#include "gdbcmd.h"

#include "memattr.h"

#include "target.h"

#include "value.h"

#include "language.h"

#include "vec.h"

#include "gdb_string.h"

const struct mem_attrib default_mem_attrib =

{

  MEM_RW,                       /* mode */

  MEM_WIDTH_UNSPECIFIED,

  0,                             /* hwbreak */

  0,                             /* cache */

  0,                             /* verify */

  -1 /* Flash blocksize not specified.  */

};

const struct mem_attrib unknown_mem_attrib =

{

  MEM_NONE,                     /* mode */

  MEM_WIDTH_UNSPECIFIED,

  0,                             /* hwbreak */

  0,                             /* cache */

  0,                             /* verify */

  -1 /* Flash blocksize not specified.  */

};

VEC(mem_region_s) *mem_region_list, *target_mem_region_list;

static int mem_number = 0;

/* If this flag is set, the memory region list should be automatically

   updated from the target.  If it is clear, the list is user-controlled

   and should be left alone.  */

static int mem_use_target = 1;

/* If this flag is set, we have tried to fetch the target memory regions

   since the last time it was invalidated.  If that list is still

   empty, then the target can't supply memory regions.  */

static int target_mem_regions_valid;

/* If this flag is set, gdb will assume that memory ranges not

   specified by the memory map have type MEM_NONE, and will

   emit errors on all accesses to that memory.  */

static int inaccessible_by_default = 1;

static void

show_inaccessible_by_default (struct ui_file *file, int from_tty,

                              struct cmd_list_element *c,

                              const char *value)

{

  if (inaccessible_by_default)

    fprintf_filtered (file, _("\

Unknown memory addresses will be treated as inaccessible.\n"));

  else

    fprintf_filtered (file, _("\

Unknown memory addresses will be treated as RAM.\n"));

}

/* Predicate function which returns true if LHS should sort before RHS

   in a list of memory regions, useful for VEC_lower_bound.  */

static int

mem_region_lessthan (const struct mem_region *lhs,

                     const struct mem_region *rhs)

{

  return lhs->lo < rhs->lo;

}

/* A helper function suitable for qsort, used to sort a

   VEC(mem_region_s) by starting address.  */

int

mem_region_cmp (const void *untyped_lhs, const void *untyped_rhs)

{

  const struct mem_region *lhs = untyped_lhs;

  const struct mem_region *rhs = untyped_rhs;

  if (lhs->lo < rhs->lo)

    return -1;

  else if (lhs->lo == rhs->lo)

    return 0;

  else

    return 1;

}

/* Allocate a new memory region, with default settings.  */

void

mem_region_init (struct mem_region *new)

{

  memset (new, 0, sizeof (struct mem_region));

  new->enabled_p = 1;

  new->attrib = default_mem_attrib;

}

/* This function should be called before any command which would

   modify the memory region list.  It will handle switching from

   a target-provided list to a local list, if necessary.  */

static void

require_user_regions (int from_tty)

{

  struct mem_region *m;

  int ix, length;

  /* If we're already using a user-provided list, nothing to do.  */

  if (!mem_use_target)

    return;

  /* Switch to a user-provided list (possibly a copy of the current

     one).  */

  mem_use_target = 0;

  /* If we don't have a target-provided region list yet, then

     no need to warn.  */

  if (mem_region_list == NULL)

    return;

  /* Otherwise, let the user know how to get back.  */

  if (from_tty)

    warning (_("Switching to manual control of memory regions; use "

               "\"mem auto\" to fetch regions from the target again."));

  /* And create a new list for the user to modify.  */

  length = VEC_length (mem_region_s, target_mem_region_list);

  mem_region_list = VEC_alloc (mem_region_s, length);

  for (ix = 0; VEC_iterate (mem_region_s, target_mem_region_list, ix, m); ix++)

    VEC_quick_push (mem_region_s, mem_region_list, m);

}

/* This function should be called before any command which would

   read the memory region list, other than those which call

   require_user_regions.  It will handle fetching the

   target-provided list, if necessary.  */

static void

require_target_regions (void)

{

  if (mem_use_target && !target_mem_regions_valid)

    {

      target_mem_regions_valid = 1;

      target_mem_region_list = target_memory_map ();

      mem_region_list = target_mem_region_list;

    }

}

static void

create_mem_region (CORE_ADDR lo, CORE_ADDR hi,

                   const struct mem_attrib *attrib)

{

  struct mem_region new;

  int i, ix;

  /* lo == hi is a useless empty region */

  if (lo >= hi && hi != 0)

    {

      printf_unfiltered (_("invalid memory region: low >= high\n"));

      return;

    }

  mem_region_init (&new);

  new.lo = lo;

  new.hi = hi;

  ix = VEC_lower_bound (mem_region_s, mem_region_list, &new,

                        mem_region_lessthan);

  /* Check for an overlapping memory region.  We only need to check

     in the vicinity - at most one before and one after the

     insertion point.  */

  for (i = ix - 1; i < ix + 1; i++)

    {

      struct mem_region *n;

      if (i < 0)

        continue;

      if (i >= VEC_length (mem_region_s, mem_region_list))

        continue;

      n = VEC_index (mem_region_s, mem_region_list, i);

      if ((lo >= n->lo && (lo < n->hi || n->hi == 0))

          || (hi > n->lo && (hi <= n->hi || n->hi == 0))

          || (lo <= n->lo && (hi >= n->hi || hi == 0)))

        {

          printf_unfiltered (_("overlapping memory region\n"));

          return;

        }

    }

  new.number = ++mem_number;

  new.attrib = *attrib;

  VEC_safe_insert (mem_region_s, mem_region_list, ix, &new);

}

/*

 * Look up the memory region cooresponding to ADDR.

 */

struct mem_region *

lookup_mem_region (CORE_ADDR addr)

{

  static struct mem_region region;

  struct mem_region *m;

  CORE_ADDR lo;

  CORE_ADDR hi;

  int ix;

  require_target_regions ();

  /* First we initialize LO and HI so that they describe the entire

     memory space.  As we process the memory region chain, they are

     redefined to describe the minimal region containing ADDR.  LO

     and HI are used in the case where no memory region is defined

     that contains ADDR.  If a memory region is disabled, it is

     treated as if it does not exist.  The initial values for LO

     and HI represent the bottom and top of memory.  */

  lo = 0;

  hi = 0;

  /* Either find memory range containing ADDRESS, or set LO and HI

     to the nearest boundaries of an existing memory range.

     If we ever want to support a huge list of memory regions, this

     check should be replaced with a binary search (probably using

     VEC_lower_bound).  */

  for (ix = 0; VEC_iterate (mem_region_s, mem_region_list, ix, m); ix++)

    {

      if (m->enabled_p == 1)

        {

          /* If the address is in the memory region, return that memory range.  */

          if (addr >= m->lo && (addr < m->hi || m->hi == 0))

            return m;

          /* This (correctly) won't match if m->hi == 0, representing

             the top of the address space, because CORE_ADDR is unsigned;

             no value of LO is less than zero.  */

          if (addr >= m->hi && lo < m->hi)

            lo = m->hi;

          /* This will never set HI to zero; if we're here and ADDR

             is at or below M, and the region starts at zero, then ADDR

             would have been in the region.  */

          if (addr <= m->lo && (hi == 0 || hi > m->lo))

            hi = m->lo;

        }

    }

  /* Because no region was found, we must cons up one based on what

     was learned above.  */

  region.lo = lo;

  region.hi = hi;

  /* When no memory map is defined at all, we always return

     'default_mem_attrib', so that we do not make all memory

     inaccessible for targets that don't provide a memory map.  */

  if (inaccessible_by_default && !VEC_empty (mem_region_s, mem_region_list))

    region.attrib = unknown_mem_attrib;

  else

    region.attrib = default_mem_attrib;

  return &region;

}

/* Invalidate any memory regions fetched from the target.  */

void

invalidate_target_mem_regions (void)

{

  if (!target_mem_regions_valid)

    return;

  target_mem_regions_valid = 0;

  VEC_free (mem_region_s, target_mem_region_list);

  if (mem_use_target)

    mem_region_list = NULL;

}

/* Clear memory region list */

static void

mem_clear (void)

{

  VEC_free (mem_region_s, mem_region_list);

}

static void

mem_command (char *args, int from_tty)

{

  CORE_ADDR lo, hi;

  char *tok;

  struct mem_attrib attrib;

  if (!args)

    error_no_arg (_("No mem"));

  /* For "mem auto", switch back to using a target provided list.  */

  if (strcmp (args, "auto") == 0)

    {

      if (mem_use_target)

        return;

      if (mem_region_list != target_mem_region_list)

        {

          mem_clear ();

          mem_region_list = target_mem_region_list;

        }

      mem_use_target = 1;

      return;

    }

  require_user_regions (from_tty);

  tok = strtok (args, " \t");

  if (!tok)

    error (_("no lo address"));

  lo = parse_and_eval_address (tok);

  tok = strtok (NULL, " \t");

  if (!tok)

    error (_("no hi address"));

  hi = parse_and_eval_address (tok);

  attrib = default_mem_attrib;

  while ((tok = strtok (NULL, " \t")) != NULL)

    {

      if (strcmp (tok, "rw") == 0)

        attrib.mode = MEM_RW;

      else if (strcmp (tok, "ro") == 0)

        attrib.mode = MEM_RO;

      else if (strcmp (tok, "wo") == 0)

        attrib.mode = MEM_WO;

      else if (strcmp (tok, "8") == 0)

        attrib.width = MEM_WIDTH_8;

      else if (strcmp (tok, "16") == 0)

        {

          if ((lo % 2 != 0) || (hi % 2 != 0))

            error (_("region bounds not 16 bit aligned"));

          attrib.width = MEM_WIDTH_16;

        }

      else if (strcmp (tok, "32") == 0)

        {

          if ((lo % 4 != 0) || (hi % 4 != 0))

            error (_("region bounds not 32 bit aligned"));

          attrib.width = MEM_WIDTH_32;

        }

      else if (strcmp (tok, "64") == 0)

        {

          if ((lo % 8 != 0) || (hi % 8 != 0))

            error (_("region bounds not 64 bit aligned"));

          attrib.width = MEM_WIDTH_64;

        }

#if 0

      else if (strcmp (tok, "hwbreak") == 0)

        attrib.hwbreak = 1;

      else if (strcmp (tok, "swbreak") == 0)

        attrib.hwbreak = 0;

#endif

      else if (strcmp (tok, "cache") == 0)

        attrib.cache = 1;

      else if (strcmp (tok, "nocache") == 0)

        attrib.cache = 0;

#if 0

      else if (strcmp (tok, "verify") == 0)

        attrib.verify = 1;

      else if (strcmp (tok, "noverify") == 0)

        attrib.verify = 0;

#endif

      else

        error (_("unknown attribute: %s"), tok);

    }

  create_mem_region (lo, hi, &attrib);

}

static void

mem_info_command (char *args, int from_tty)

{

  struct mem_region *m;

  struct mem_attrib *attrib;

  int ix;

  if (mem_use_target)

    printf_filtered (_("Using memory regions provided by the target.\n"));

  else

    printf_filtered (_("Using user-defined memory regions.\n"));

  require_target_regions ();

  if (!mem_region_list)

    {

      printf_unfiltered (_("There are no memory regions defined.\n"));

      return;

    }

  printf_filtered ("Num ");

  printf_filtered ("Enb ");

  printf_filtered ("Low Addr   ");

  if (gdbarch_addr_bit (target_gdbarch) > 32)

    printf_filtered ("        ");

  printf_filtered ("High Addr  ");

  if (gdbarch_addr_bit (target_gdbarch) > 32)

    printf_filtered ("        ");

  printf_filtered ("Attrs ");

  printf_filtered ("\n");

  for (ix = 0; VEC_iterate (mem_region_s, mem_region_list, ix, m); ix++)

    {

      char *tmp;

      printf_filtered ("%-3d %-3c\t",

                       m->number,

                       m->enabled_p ? 'y' : 'n');

      if (gdbarch_addr_bit (target_gdbarch) <= 32)

        tmp = hex_string_custom ((unsigned long) m->lo, 8);

      else

        tmp = hex_string_custom ((unsigned long) m->lo, 16);

      printf_filtered ("%s ", tmp);

      if (gdbarch_addr_bit (target_gdbarch) <= 32)

        {

          if (m->hi == 0)

            tmp = "0x100000000";

          else

            tmp = hex_string_custom ((unsigned long) m->hi, 8);

        }

      else

        {

          if (m->hi == 0)

            tmp = "0x10000000000000000";

          else

            tmp = hex_string_custom ((unsigned long) m->hi, 16);

        }

      printf_filtered ("%s ", tmp);

      /* Print a token for each attribute.

       * FIXME: Should we output a comma after each token?  It may

       * make it easier for users to read, but we'd lose the ability

       * to cut-and-paste the list of attributes when defining a new

       * region.  Perhaps that is not important.

       *

       * FIXME: If more attributes are added to GDB, the output may

       * become cluttered and difficult for users to read.  At that

       * time, we may want to consider printing tokens only if they

       * are different from the default attribute.  */

      attrib = &m->attrib;

      switch (attrib->mode)

        {

        case MEM_RW:

          printf_filtered ("rw ");

          break;

        case MEM_RO:

          printf_filtered ("ro ");

          break;

        case MEM_WO:

          printf_filtered ("wo ");

          break;

        case MEM_FLASH:

          printf_filtered ("flash blocksize 0x%x ", attrib->blocksize);

          break;

        }

      switch (attrib->width)

        {

        case MEM_WIDTH_8:

          printf_filtered ("8 ");

          break;

        case MEM_WIDTH_16:

          printf_filtered ("16 ");

          break;

        case MEM_WIDTH_32:

          printf_filtered ("32 ");

          break;

        case MEM_WIDTH_64:

          printf_filtered ("64 ");

          break;

        case MEM_WIDTH_UNSPECIFIED:

          break;

        }

#if 0

      if (attrib->hwbreak)

        printf_filtered ("hwbreak");

      else

        printf_filtered ("swbreak");

#endif

      if (attrib->cache)

        printf_filtered ("cache ");

      else

        printf_filtered ("nocache ");

#if 0

      if (attrib->verify)

        printf_filtered ("verify ");

      else

        printf_filtered ("noverify ");

#endif

      printf_filtered ("\n");

      gdb_flush (gdb_stdout);

    }

}

/* Enable the memory region number NUM. */

static void

mem_enable (int num)

{

  struct mem_region *m;

  int ix;

  for (ix = 0; VEC_iterate (mem_region_s, mem_region_list, ix, m); ix++)

    if (m->number == num)

      {

        m->enabled_p = 1;

        return;

      }

  printf_unfiltered (_("No memory region number %d.\n"), num);

}

static void

mem_enable_command (char *args, int from_tty)

{

  char *p = args;

  char *p1;

  int num;

  struct mem_region *m;

  int ix;

  require_user_regions (from_tty);

  target_dcache_invalidate ();

  if (p == 0)

    {

      for (ix = 0; VEC_iterate (mem_region_s, mem_region_list, ix, m); ix++)

        m->enabled_p = 1;

    }

  else

    while (*p)

      {

        p1 = p;

        while (*p1 >= '0' && *p1 <= '9')

          p1++;

        if (*p1 && *p1 != ' ' && *p1 != '\t')

          error (_("Arguments must be memory region numbers."));

        num = atoi (p);

        mem_enable (num);

        p = p1;

        while (*p == ' ' || *p == '\t')

          p++;

      }

}

/* Disable the memory region number NUM. */

static void

mem_disable (int num)

{

  struct mem_region *m;

  int ix;

  for (ix = 0; VEC_iterate (mem_region_s, mem_region_list, ix, m); ix++)

    if (m->number == num)

      {

        m->enabled_p = 0;

        return;

      }

  printf_unfiltered (_("No memory region number %d.\n"), num);

}

static void

mem_disable_command (char *args, int from_tty)

{

  char *p = args;

  char *p1;

  int num;

  struct mem_region *m;

  int ix;

  require_user_regions (from_tty);

  target_dcache_invalidate ();

  if (p == 0)

    {

      for (ix = 0; VEC_iterate (mem_region_s, mem_region_list, ix, m); ix++)

        m->enabled_p = 0;

    }

  else

    while (*p)

      {

        p1 = p;

        while (*p1 >= '0' && *p1 <= '9')

          p1++;

        if (*p1 && *p1 != ' ' && *p1 != '\t')

          error (_("Arguments must be memory region numbers."));

        num = atoi (p);

        mem_disable (num);

        p = p1;

        while (*p == ' ' || *p == '\t')

          p++;

      }

}

/* Delete the memory region number NUM. */

static void

mem_delete (int num)

{

  struct mem_region *m;

  int ix;

  if (!mem_region_list)

    {

      printf_unfiltered (_("No memory region number %d.\n"), num);

      return;

    }

  for (ix = 0; VEC_iterate (mem_region_s, mem_region_list, ix, m); ix++)

    if (m->number == num)

      break;

  if (m == NULL)

    {

      printf_unfiltered (_("No memory region number %d.\n"), num);

      return;

    }

  VEC_ordered_remove (mem_region_s, mem_region_list, ix);

}

static void

mem_delete_command (char *args, int from_tty)

{

  char *p = args;

  char *p1;

  int num;